The void type. There is one built-in type of this class, void.
Note that there are no foreign objects of this type. It is, however, used as a return type for foreignFunction. Such functions will return null. It may also be used by itself as an argument type to indicate functions that take no arguments.
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The object ForeignVoidType is a type, with ancestor classes ForeignType < Type < MutableHashTable < HashTable < Thing.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/ForeignFunctions.m2:916:0.